'Diplex' definitions:

Definition of 'Diplex'

From: GCIDE

Diplex \Di"plex\, a. [Pref. di- + -plex, as in duplex.] (Teleg.) Pertaining to the sending of two messages in the same direction at the same time. Diplex and contraplex are the two varieties of duplex. [Webster 1913 Suppl.]